In this revealing account of how the digital universe exploded in the aftermath of World War II, George Dyson illuminates the nature of digital computers, the lives of those who brought them into existence, and how code took over the world.

1953 -- Olden farm -- Veblen's circle -- Neumann Janos -- MANIAC -- Fuld 219 -- 6J6 -- V-40 -- Cyclogenesis -- Monte Carlo -- Ulam's demons -- Barricelli's universe -- Turing's cathedral -- Engineer's dreams -- Theory of self-reproducing automata -- Mach 9 -- The tale of the big computer -- The thirty-ninth step.